Technical data

4-1
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_ 9050 Troubleshooting .
Procedure
Start.
I
S(itch the computer on.
Power indication LEOs and fans OK? (OT - OFF,
Power On
- ON, IB - ON, Stack PS - OFF.)
Y1ES ~~rect overtemperature, power supply, or fans problems.
Chapter 5.
Stack
LEOs OK? (On for 112 second then all off.)
YES NO
I Replace faulty stack board then retest. Faulty board corresponds to lit LED.
Is terminal or printer available as output device?
YES NO
Use
the I/O card LEOs to indicate card failure.
Use the I/O card cage LEOs to indicate I/O channel failure and I/O error code.
Error code chart
in Chapter 5.
Troubleshoot and repair the I/O channels.
Use the error messages on the output device to determine faults. Error messages are in Chapter 5.
Also available, to support the error messages, is a Normal Operation Sequence chart in Chapter 5.